This is a 2006 GMC Yukon Denali with a 6.0 liter (37K miles) The front transmission pump seal was a leak'n tranny fluid out the bottom of the bell housing. (Top-This is a view of the front pump and seal with the torque converter slipped out.) Note the depth of the torque converted with reference to the bell housing before removing it. It will install with three clicks and thus three depth increments. The final click is the two notches you see in the torque converter sleeve. You'll have to rotate it 1/4 turn back and forth to get it to seat properly. (second from top) The seal is secured with a retainer clip. remove it as shown by
twisting a small flat head screw driver CC (counter clockwise). This prevents distortion to the front of the retainer. (third from top) Use a seal puller to remove the seal. Be careful to contact only the seal with the puller. It's like playing "hot lava" as a kid or Operation but with the intention of not scratching anything and creating a new leak. (fouth from top) Use loctite or gasket maker VERY thin around the outer sealing corner of the seal. (ort! ort!) This is cheap insurance against Murphy's law.
(bottom) Use a mason jar to start the seal evenly. This allows you to see all around that you're even and they fit the groove perfectly. Use a leather glove on your right hand and bop the jar squarely to get a nice even seat. I've never broken a jar doing this. That's because I make sure everything is perfectly square. You can stand on a jar even if you're 250lbs as long as you're squared getting on and off. So after it's started on there press on one side with your thumb about 15-20 pounds worth and hit the other side with a ball pin hammer. then go around the seal in a circle lightly tapping it in. You know like Happy Gilmore tap tap tap-a-roo! Then you press the retainer back on using your thumbs on opposite sides. New seals from the dealer have some bearing grease in the valley of the rubber seal. Ones in a tranny kit don't. I recommend using a little on the seal or torque converter sleeve to help with install and break in. You know, it's a Murphy's Law kind of thing.
